feat(lang): friend module lab of fishing, data - a friend of the modules it names

A scoped friend sees those modules' private names and only the exports
of every other; a plain friend module still sees everything. Reseed.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

examples/rejected/friend_scope.ludic

@@ -0,0 +1,10 @@
+# L3: a friend of kit is not a friend of bank - bank's private `add` stays out of reach
+import "private_bank"
+import "private_kit"
+program FriendScope {
+  friend module lab of kit
+  entry {
+    add(5)
+    print(total())
+  }
+}